Tool for bending springs



W.-D. DOONAN.

TOOL FOR BENDING SPRINGS. APPLICATION FiLED 050.9, 1921.

1,417,390, Patented May 30;1922.

FIG 3 UNITED STATES PATENT OFFICE WILLIAM DANIEL DOONAN, BUTTE, MONTANA.

TOOL FOR BENDING SPRINGS.

Application filed December 9, 1921.

To all whom it may concern:

Be it known that I, WILLIAM D. DOONAN, a citizen of the United States,residing at Butte, in the county of Silverbow and State of Montana, haveinvented certain new and useful Improvements in Tools for BendlngSprings, of which the following is a specification.

This invention relates to tools for bending metal, and more particularlyto hand 0perated tools for bending curved leaf springs; and it consistsin the novel construction and combination of the parts hereinafter fullydescribed and claimed, whereby the leaf springs of motors cars whichhave deteriorated by use are re-set and restored to their originalstrength and elasticity without injury to the original temper of thesprlngs.

In the drawings, Figure 1 is a front view of a tool for bending springsconstructed according to this invention. Fig. 2 is a side view of thesame. Fig. 3 is an end view of the jaws.

Two levers 5 and 6 are provided, and are pivoted by pins 7 to the endportions of two links 8 which straddle their middle portions. The freeend portion 9 of the lever 5 is longer than the free end portlon of thelever 6 and forms one bending jaw of the tool. The lever 6 has aprojection 10 on its free end portionv which forms a shoulder 12, and ablock 14 is secured on this projection 10 against the shoulder 12. Theprojection 10 is preferably rectangular to prevent the block fromturning, and its end 15 is riveted over to hold the block securely inplace.

The block 14 has a concave face 16 ar ranged opposite the jaw 9, andprojecting laterally on each side of it. The block 14 forms the otherjaw, and the leaf spring is set up by pressure between these two aws. Aportion of the leaf spring 18 is shown in dotted lines. The spring isheated shghtly, but not sufficiently to draw its original temper, and itis found that springs can be successively re-bent and set up in thismanner, provided the jaws are accurately set with relation to each otherso as not to bend the spring too much and thereby strain it.

The levers 5 and 6 are operated by means Specification of LettersPatent.

Patented May 30, 1922.

Serial No. 521,152.

of two long handles 20 and 21, which are pivoted together at one end bya pin 22, and which have stops 24 at their middle parts which limittheir movement toward each other.

Adjusting links 25 and 26 are provided, and are pivoted at one end bypins 27 to the handles between the pivot 22 and the stops. The links arepivoted at the other end to the end portions of the levers 5 and 6 bypins 28. Set-screws 30 are screwed into holes in the adjusting linksadjacent to the pins 28, and their ends bear against the outersides ofthe handles. When the screws 30 are screwed up a little they increasethe normal distance between the two pins 28, so that the bending jawsare moved closer together.

The bending jaws are accurately set by means of the set-screws so thatthe leaf spring is bent to the maximum extent desired when the stops 2 1on the handles come together. The handles are relatively very long sothat the leverage is very great, and so that the heated springs can bere-bent and set up by hand power without injury to them.

What I claim is:

1. A bending tool, comprising two pivoted levers one of which has astraight longitudinal end portion which forms one bending jaw, and ablock arranged crosswise of the said jaw and secured to thecorresponding .end portion of the other lever and provided with aconcave bending surface which projects laterally on each side of thesaid jaw.

2. A bending tool, comprising two levers one of which has a straightlongitudinal end portion which forms one bending aw, links arrangedcrosswise of the middle parts of the said levers and having their endportions pivoted to them, and a block arranged crosswise of the said jawand secured to the corresponding end portion of the other lever andprovided with a concave bending surface which projects laterally on eachside of the said aw.

3. A bending tool, comprising two pivoted levers one of which has astraight longitudinal end portion which forms one bending jaw, and ablock arranged crosswise ofthe said jaw and secured to the correspondingsaid levers, and means for setting the adjusting links laterally withrespect to the handles.

In testimony whereof I have afiixed my signature.

*VVILLIAM DANIEL DOONAN.

